Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * ip_vs_est.c: simple rate estimator for IPVS |
| 3 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4 | * Authors: Wensong Zhang <wensong@linuxvirtualserver.org> |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or |
| 7 | * modify it under the terms of the GNU General Public License |
| 8 | * as published by the Free Software Foundation; either version |
| 9 | * 2 of the License, or (at your option) any later version. |
| 10 | * |
Hans Schillstrom | 29c2026 | 2011-01-03 14:44:54 +0100 | [diff] [blame^] | 11 | * Changes: Hans Schillstrom <hans.schillstrom@ericsson.com> |
| 12 | * Network name space (netns) aware. |
| 13 | * Global data moved to netns i.e struct netns_ipvs |
| 14 | * Affected data: est_list and est_lock. |
| 15 | * estimation_timer() runs with timer per netns. |
| 16 | * get_stats()) do the per cpu summing. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 17 | */ |
Hannes Eder | 9aada7a | 2009-07-30 14:29:44 -0700 | [diff] [blame] | 18 | |
| 19 | #define KMSG_COMPONENT "IPVS" |
| 20 | #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt |
| 21 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 22 | #include <linux/kernel.h> |
Arnaldo Carvalho de Melo | 14c8502 | 2005-12-27 02:43:12 -0200 | [diff] [blame] | 23 | #include <linux/jiffies.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 24 | #include <linux/types.h> |
Adrian Bunk | 4ffd2e4 | 2006-01-05 12:14:43 -0800 | [diff] [blame] | 25 | #include <linux/interrupt.h> |
Pavel Emelyanov | 90754f8 | 2008-01-12 02:33:50 -0800 | [diff] [blame] | 26 | #include <linux/sysctl.h> |
Sven Wegener | 3a14a313 | 2008-08-10 18:24:41 +0000 | [diff] [blame] | 27 | #include <linux/list.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 28 | |
| 29 | #include <net/ip_vs.h> |
| 30 | |
| 31 | /* |
| 32 | This code is to estimate rate in a shorter interval (such as 8 |
| 33 | seconds) for virtual services and real servers. For measure rate in a |
| 34 | long interval, it is easy to implement a user level daemon which |
| 35 | periodically reads those statistical counters and measure rate. |
| 36 | |
| 37 | Currently, the measurement is activated by slow timer handler. Hope |
| 38 | this measurement will not introduce too much load. |
| 39 | |
| 40 | We measure rate during the last 8 seconds every 2 seconds: |
| 41 | |
| 42 | avgrate = avgrate*(1-W) + rate*W |
| 43 | |
| 44 | where W = 2^(-2) |
| 45 | |
| 46 | NOTES. |
| 47 | |
| 48 | * The stored value for average bps is scaled by 2^5, so that maximal |
| 49 | rate is ~2.15Gbits/s, average pps and cps are scaled by 2^10. |
| 50 | |
| 51 | * A lot code is taken from net/sched/estimator.c |
| 52 | */ |
| 53 | |
| 54 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 55 | static void estimation_timer(unsigned long arg) |
| 56 | { |
| 57 | struct ip_vs_estimator *e; |
| 58 | struct ip_vs_stats *s; |
| 59 | u32 n_conns; |
| 60 | u32 n_inpkts, n_outpkts; |
| 61 | u64 n_inbytes, n_outbytes; |
| 62 | u32 rate; |
Hans Schillstrom | 29c2026 | 2011-01-03 14:44:54 +0100 | [diff] [blame^] | 63 | struct net *net = (struct net *)arg; |
| 64 | struct netns_ipvs *ipvs; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 65 | |
Hans Schillstrom | 29c2026 | 2011-01-03 14:44:54 +0100 | [diff] [blame^] | 66 | ipvs = net_ipvs(net); |
| 67 | spin_lock(&ipvs->est_lock); |
| 68 | list_for_each_entry(e, &ipvs->est_list, list) { |
Sven Wegener | 3a14a313 | 2008-08-10 18:24:41 +0000 | [diff] [blame] | 69 | s = container_of(e, struct ip_vs_stats, est); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 70 | |
| 71 | spin_lock(&s->lock); |
Sven Wegener | e9c0ce2 | 2008-09-08 13:39:04 +0200 | [diff] [blame] | 72 | n_conns = s->ustats.conns; |
| 73 | n_inpkts = s->ustats.inpkts; |
| 74 | n_outpkts = s->ustats.outpkts; |
| 75 | n_inbytes = s->ustats.inbytes; |
| 76 | n_outbytes = s->ustats.outbytes; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 77 | |
| 78 | /* scaled by 2^10, but divided 2 seconds */ |
Hans Schillstrom | 29c2026 | 2011-01-03 14:44:54 +0100 | [diff] [blame^] | 79 | rate = (n_conns - e->last_conns) << 9; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 80 | e->last_conns = n_conns; |
Hans Schillstrom | 29c2026 | 2011-01-03 14:44:54 +0100 | [diff] [blame^] | 81 | e->cps += ((long)rate - (long)e->cps) >> 2; |
| 82 | s->ustats.cps = (e->cps + 0x1FF) >> 10; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 83 | |
Hans Schillstrom | 29c2026 | 2011-01-03 14:44:54 +0100 | [diff] [blame^] | 84 | rate = (n_inpkts - e->last_inpkts) << 9; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 85 | e->last_inpkts = n_inpkts; |
Hans Schillstrom | 29c2026 | 2011-01-03 14:44:54 +0100 | [diff] [blame^] | 86 | e->inpps += ((long)rate - (long)e->inpps) >> 2; |
| 87 | s->ustats.inpps = (e->inpps + 0x1FF) >> 10; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 88 | |
Hans Schillstrom | 29c2026 | 2011-01-03 14:44:54 +0100 | [diff] [blame^] | 89 | rate = (n_outpkts - e->last_outpkts) << 9; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 90 | e->last_outpkts = n_outpkts; |
Hans Schillstrom | 29c2026 | 2011-01-03 14:44:54 +0100 | [diff] [blame^] | 91 | e->outpps += ((long)rate - (long)e->outpps) >> 2; |
| 92 | s->ustats.outpps = (e->outpps + 0x1FF) >> 10; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 93 | |
Hans Schillstrom | 29c2026 | 2011-01-03 14:44:54 +0100 | [diff] [blame^] | 94 | rate = (n_inbytes - e->last_inbytes) << 4; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 95 | e->last_inbytes = n_inbytes; |
Hans Schillstrom | 29c2026 | 2011-01-03 14:44:54 +0100 | [diff] [blame^] | 96 | e->inbps += ((long)rate - (long)e->inbps) >> 2; |
| 97 | s->ustats.inbps = (e->inbps + 0xF) >> 5; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 98 | |
Hans Schillstrom | 29c2026 | 2011-01-03 14:44:54 +0100 | [diff] [blame^] | 99 | rate = (n_outbytes - e->last_outbytes) << 4; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 100 | e->last_outbytes = n_outbytes; |
Hans Schillstrom | 29c2026 | 2011-01-03 14:44:54 +0100 | [diff] [blame^] | 101 | e->outbps += ((long)rate - (long)e->outbps) >> 2; |
| 102 | s->ustats.outbps = (e->outbps + 0xF) >> 5; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 103 | spin_unlock(&s->lock); |
| 104 | } |
Hans Schillstrom | 29c2026 | 2011-01-03 14:44:54 +0100 | [diff] [blame^] | 105 | spin_unlock(&ipvs->est_lock); |
| 106 | mod_timer(&ipvs->est_timer, jiffies + 2*HZ); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 107 | } |
| 108 | |
Hans Schillstrom | 29c2026 | 2011-01-03 14:44:54 +0100 | [diff] [blame^] | 109 | void ip_vs_new_estimator(struct net *net, struct ip_vs_stats *stats) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 110 | { |
Hans Schillstrom | 29c2026 | 2011-01-03 14:44:54 +0100 | [diff] [blame^] | 111 | struct netns_ipvs *ipvs = net_ipvs(net); |
Sven Wegener | 3a14a313 | 2008-08-10 18:24:41 +0000 | [diff] [blame] | 112 | struct ip_vs_estimator *est = &stats->est; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 113 | |
Sven Wegener | 3a14a313 | 2008-08-10 18:24:41 +0000 | [diff] [blame] | 114 | INIT_LIST_HEAD(&est->list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 115 | |
Sven Wegener | e9c0ce2 | 2008-09-08 13:39:04 +0200 | [diff] [blame] | 116 | est->last_conns = stats->ustats.conns; |
| 117 | est->cps = stats->ustats.cps<<10; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 118 | |
Sven Wegener | e9c0ce2 | 2008-09-08 13:39:04 +0200 | [diff] [blame] | 119 | est->last_inpkts = stats->ustats.inpkts; |
| 120 | est->inpps = stats->ustats.inpps<<10; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 121 | |
Sven Wegener | e9c0ce2 | 2008-09-08 13:39:04 +0200 | [diff] [blame] | 122 | est->last_outpkts = stats->ustats.outpkts; |
| 123 | est->outpps = stats->ustats.outpps<<10; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 124 | |
Sven Wegener | e9c0ce2 | 2008-09-08 13:39:04 +0200 | [diff] [blame] | 125 | est->last_inbytes = stats->ustats.inbytes; |
| 126 | est->inbps = stats->ustats.inbps<<5; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 127 | |
Sven Wegener | e9c0ce2 | 2008-09-08 13:39:04 +0200 | [diff] [blame] | 128 | est->last_outbytes = stats->ustats.outbytes; |
| 129 | est->outbps = stats->ustats.outbps<<5; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 130 | |
Hans Schillstrom | 29c2026 | 2011-01-03 14:44:54 +0100 | [diff] [blame^] | 131 | spin_lock_bh(&ipvs->est_lock); |
| 132 | list_add(&est->list, &ipvs->est_list); |
| 133 | spin_unlock_bh(&ipvs->est_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 134 | } |
| 135 | |
Hans Schillstrom | 29c2026 | 2011-01-03 14:44:54 +0100 | [diff] [blame^] | 136 | void ip_vs_kill_estimator(struct net *net, struct ip_vs_stats *stats) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 137 | { |
Hans Schillstrom | 29c2026 | 2011-01-03 14:44:54 +0100 | [diff] [blame^] | 138 | struct netns_ipvs *ipvs = net_ipvs(net); |
Sven Wegener | 3a14a313 | 2008-08-10 18:24:41 +0000 | [diff] [blame] | 139 | struct ip_vs_estimator *est = &stats->est; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 140 | |
Hans Schillstrom | 29c2026 | 2011-01-03 14:44:54 +0100 | [diff] [blame^] | 141 | spin_lock_bh(&ipvs->est_lock); |
Sven Wegener | 3a14a313 | 2008-08-10 18:24:41 +0000 | [diff] [blame] | 142 | list_del(&est->list); |
Hans Schillstrom | 29c2026 | 2011-01-03 14:44:54 +0100 | [diff] [blame^] | 143 | spin_unlock_bh(&ipvs->est_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 144 | } |
| 145 | |
| 146 | void ip_vs_zero_estimator(struct ip_vs_stats *stats) |
| 147 | { |
Sven Wegener | 3a14a313 | 2008-08-10 18:24:41 +0000 | [diff] [blame] | 148 | struct ip_vs_estimator *est = &stats->est; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 149 | |
Sven Wegener | 3a14a313 | 2008-08-10 18:24:41 +0000 | [diff] [blame] | 150 | /* set counters zero, caller must hold the stats->lock lock */ |
| 151 | est->last_inbytes = 0; |
| 152 | est->last_outbytes = 0; |
| 153 | est->last_conns = 0; |
| 154 | est->last_inpkts = 0; |
| 155 | est->last_outpkts = 0; |
| 156 | est->cps = 0; |
| 157 | est->inpps = 0; |
| 158 | est->outpps = 0; |
| 159 | est->inbps = 0; |
| 160 | est->outbps = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 161 | } |
Sven Wegener | a919cf4 | 2008-08-14 00:47:16 +0200 | [diff] [blame] | 162 | |
Hans Schillstrom | 61b1ab4 | 2011-01-03 14:44:42 +0100 | [diff] [blame] | 163 | static int __net_init __ip_vs_estimator_init(struct net *net) |
| 164 | { |
Hans Schillstrom | 29c2026 | 2011-01-03 14:44:54 +0100 | [diff] [blame^] | 165 | struct netns_ipvs *ipvs = net_ipvs(net); |
| 166 | |
Hans Schillstrom | 61b1ab4 | 2011-01-03 14:44:42 +0100 | [diff] [blame] | 167 | if (!net_eq(net, &init_net)) /* netns not enabled yet */ |
| 168 | return -EPERM; |
| 169 | |
Hans Schillstrom | 29c2026 | 2011-01-03 14:44:54 +0100 | [diff] [blame^] | 170 | INIT_LIST_HEAD(&ipvs->est_list); |
| 171 | spin_lock_init(&ipvs->est_lock); |
| 172 | setup_timer(&ipvs->est_timer, estimation_timer, (unsigned long)net); |
| 173 | mod_timer(&ipvs->est_timer, jiffies + 2 * HZ); |
Hans Schillstrom | 61b1ab4 | 2011-01-03 14:44:42 +0100 | [diff] [blame] | 174 | return 0; |
| 175 | } |
| 176 | |
Hans Schillstrom | 29c2026 | 2011-01-03 14:44:54 +0100 | [diff] [blame^] | 177 | static void __net_exit __ip_vs_estimator_exit(struct net *net) |
| 178 | { |
| 179 | del_timer_sync(&net_ipvs(net)->est_timer); |
| 180 | } |
Hans Schillstrom | 61b1ab4 | 2011-01-03 14:44:42 +0100 | [diff] [blame] | 181 | static struct pernet_operations ip_vs_app_ops = { |
| 182 | .init = __ip_vs_estimator_init, |
Hans Schillstrom | 29c2026 | 2011-01-03 14:44:54 +0100 | [diff] [blame^] | 183 | .exit = __ip_vs_estimator_exit, |
Hans Schillstrom | 61b1ab4 | 2011-01-03 14:44:42 +0100 | [diff] [blame] | 184 | }; |
| 185 | |
Sven Wegener | a919cf4 | 2008-08-14 00:47:16 +0200 | [diff] [blame] | 186 | int __init ip_vs_estimator_init(void) |
| 187 | { |
Hans Schillstrom | 61b1ab4 | 2011-01-03 14:44:42 +0100 | [diff] [blame] | 188 | int rv; |
| 189 | |
| 190 | rv = register_pernet_subsys(&ip_vs_app_ops); |
Hans Schillstrom | 61b1ab4 | 2011-01-03 14:44:42 +0100 | [diff] [blame] | 191 | return rv; |
Sven Wegener | a919cf4 | 2008-08-14 00:47:16 +0200 | [diff] [blame] | 192 | } |
| 193 | |
| 194 | void ip_vs_estimator_cleanup(void) |
| 195 | { |
Hans Schillstrom | 61b1ab4 | 2011-01-03 14:44:42 +0100 | [diff] [blame] | 196 | unregister_pernet_subsys(&ip_vs_app_ops); |
Sven Wegener | a919cf4 | 2008-08-14 00:47:16 +0200 | [diff] [blame] | 197 | } |